How popular is Eideard?

Eideard is an unusual given name for men. Eideard is an unusual surname too for both adults and children. (2000 U.S. Demographics)

Which version is better?

with its source form and related boy names. Eduardo(#251 from recent data), Edward(#158) and Edwardo are the prominent related forms of Eideard (outside Top 2000) appearing in the Top 2000. Adoption of these forms of Eideard was more pronounced among parents during the years 1880-1889 (adoption of 2.11%) and has become much less since (adoption 0.21%, down 90%). (2015 U.S. SSA Records)